<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <button>请求</button>
  <div></div>
  <script src="./promise.js"></script>
  <script>
    document.querySelector('button').addEventListener('click', function () {
      const str = document.querySelector('div')
      Promise.all(
        [
          newAjax({ method: 'GET', url: 'http://ajax-base-api-t.itheima.net/api/getbooks' }),
          newAjax({ method: 'POST', url: 'http://ajax-base-api-t.itheima.net/api/addbook' })
        ]).then(
          res => str.innerHTML = '这是主页',
          error => str.innerHTML = error
        )
    })

  </script>
</body>

</html>